diff options
Diffstat (limited to 'drivers/hwmon/lm75.c')
| -rw-r--r-- | drivers/hwmon/lm75.c | 268 |
1 files changed, 161 insertions, 107 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c index de698dc73020..8f9595f2fb53 100644 --- a/drivers/hwmon/lm75.c +++ b/drivers/hwmon/lm75.c @@ -30,14 +30,37 @@ #include "lm75.h" -/* Addresses to scan */ +/* + * This driver handles the LM75 and compatible digital temperature sensors. + * Only types which are _not_ listed in I2C_CLIENT_INSMOD_*() need to be + * listed here. We start at 9 since I2C_CLIENT_INSMOD_*() currently allow + * definition of up to 8 chip types (plus zero). + */ + +enum lm75_type { /* keep sorted in alphabetical order */ + ds1775 = 9, + ds75, + /* lm75 -- in I2C_CLIENT_INSMOD_1() */ + lm75a, + max6625, + max6626, + mcp980x, + stds75, + tcn75, + tmp100, + tmp101, + tmp175, + tmp275, + tmp75, +}; + +/* Addresses scanned */ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; /* Insmod parameters */ I2C_CLIENT_INSMOD_1(lm75); -/* Many LM75 constants specified below */ /* The LM75 registers */ #define LM75_REG_CONF 0x01 @@ -49,10 +72,10 @@ static const u8 LM75_REG_TEMP[3] = { /* Each client has this additional data */ struct lm75_data { - struct i2c_client client; - struct device *hwmon_dev; + struct device *hwmon_dev; struct mutex update_lock; - char valid; /* !=0 if following fields are valid */ + u8 orig_conf; + char valid; /* !=0 if registers are valid */ unsigned long last_updated; /* In jiffies */ u16 temp[3]; /* Register values, 0 = input @@ -60,23 +83,14 @@ struct lm75_data { 2 = hyst */ }; -static int lm75_attach_adapter(struct i2c_adapter *adapter); -static int lm75_detect(struct i2c_adapter *adapter, int address, int kind); -static void lm75_init_client(struct i2c_client *client); -static int lm75_detach_client(struct i2c_client *client); static int lm75_read_value(struct i2c_client *client, u8 reg); static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value); static struct lm75_data *lm75_update_device(struct device *dev); -/* This is the driver that will be inserted */ -static struct i2c_driver lm75_driver = { - .driver = { - .name = "lm75", - }, - .attach_adapter = lm75_attach_adapter, - .detach_client = lm75_detach_client, -}; +/*-----------------------------------------------------------------------*/ + +/* sysfs attributes for hwmon */ static ssize_t show_temp(struct device *dev, struct device_attribute *da, char *buf) @@ -109,13 +123,6 @@ static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp, set_temp, 2); static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0); -static int lm75_attach_adapter(struct i2c_adapter *adapter) -{ - if (!(adapter->class & I2C_CLASS_HWMON)) - return 0; - return i2c_probe(adapter, &addr_data, lm75_detect); -} - static struct attribute *lm75_attributes[] = { &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp1_max.dev_attr.attr, @@ -128,33 +135,114 @@ static const struct attribute_group lm75_group = { .attrs = lm75_attributes, }; -/* This function is called by i2c_probe */ -static int lm75_detect(struct i2c_adapter *adapter, int address, int kind) +/*-----------------------------------------------------------------------*/ + +/* device probe and removal */ + +static int +lm75_probe(struct i2c_client *client, const struct i2c_device_id *id) { - int i; - struct i2c_client *new_client; struct lm75_data *data; - int err = 0; - const char *name = ""; + int status; + u8 set_mask, clr_mask; + int new; - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | - I2C_FUNC_SMBUS_WORD_DATA)) - goto exit; - - /* OK. For now, we presume we have a valid client. We now create the - client structure, even though we cannot fill it completely yet. - But it allows us to access lm75_{read,write}_value. */ - if (!(data = kzalloc(sizeof(struct lm75_data), GFP_KERNEL))) { - err = -ENOMEM; - goto exit; + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) + return -EIO; + + data = kzalloc(sizeof(struct lm75_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + i2c_set_clientdata(client, data); + mutex_init(&data->update_lock); + + /* Set to LM75 resolution (9 bits, 1/2 degree C) and range. + * Then tweak to be more precise when appropriate. + */ + set_mask = 0; + clr_mask = (1 << 0) /* continuous conversions */ + | (1 << 6) | (1 << 5); /* 9-bit mode */ + + /* configure as specified */ + status = lm75_read_value(client, LM75_REG_CONF); + if (status < 0) { + dev_dbg(&client->dev, "Can't read config? %d\n", status); + goto exit_free; } + data->orig_conf = status; + new = status & ~clr_mask; + new |= set_mask; + if (status != new) + lm75_write_value(client, LM75_REG_CONF, new); + dev_dbg(&client->dev, "Config %02x\n", new); + + /* Register sysfs hooks */ + status = sysfs_create_group(&client->dev.kobj, &lm75_group); + if (status) + goto exit_free; + + data->hwmon_dev = hwmon_device_register(&client->dev); + if (IS_ERR(data->hwmon_dev)) { + status = PTR_ERR(data->hwmon_dev); + goto exit_remove; + } + + dev_info(&client->dev, "%s: sensor '%s'\n", + data->hwmon_dev->bus_id, client->name); + + return 0; + +exit_remove: + sysfs_remove_group(&client->dev.kobj, &lm75_group); +exit_free: + i2c_set_clientdata(client, NULL); + kfree(data); + return status; +} + +static int lm75_remove(struct i2c_client *client) +{ + struct lm75_data *data = i2c_get_clientdata(client); + + hwmon_device_unregister(data->hwmon_dev); + sysfs_remove_group(&client->dev.kobj, &lm75_group); + lm75_write_value(client, LM75_REG_CONF, data->orig_conf); + i2c_set_clientdata(client, NULL); + kfree(data); + return 0; +} + +static const struct i2c_device_id lm75_ids[] = { + { "ds1775", ds1775, }, + { "ds75", ds75, }, + { "lm75", lm75, }, + { "lm75a", lm75a, }, + { "max6625", max6625, }, + { "max6626", max6626, }, + { "mcp980x", mcp980x, }, + { "stds75", stds75, }, + { "tcn75", tcn75, }, + { "tmp100", tmp100, }, + { "tmp101", tmp101, }, + { "tmp175", tmp175, }, + { "tmp275", tmp275, }, + { "tmp75", tmp75, }, + { /* LIST END */ } +}; +MODULE_DEVICE_TABLE(i2c, lm75_ids); + +/* Return 0 if detection is successful, -ENODEV otherwise */ +static int lm75_detect(struct i2c_client *new_client, int kind, + struct i2c_board_info *info) +{ + struct i2c_adapter *adapter = new_client->adapter; + int i; - new_client = &data->client; - i2c_set_clientdata(new_client, data); - new_client->addr = address; - new_client->adapter = adapter; - new_client->driver = &lm75_driver; - new_client->flags = 0; + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | + I2C_FUNC_SMBUS_WORD_DATA)) + return -ENODEV; /* Now, we do the remaining detection. There is no identification- dedicated register so we have to rely on several tricks: @@ -174,77 +262,49 @@ static int lm75_detect(struct i2c_adapter *adapter, int address, int kind) || i2c_smbus_read_word_data(new_client, 5) != hyst || i2c_smbus_read_word_data(new_client, 6) != hyst || i2c_smbus_read_word_data(new_client, 7) != hyst) - goto exit_free; + return -ENODEV; os = i2c_smbus_read_word_data(new_client, 3); if (i2c_smbus_read_word_data(new_client, 4) != os || i2c_smbus_read_word_data(new_client, 5) != os || i2c_smbus_read_word_data(new_client, 6) != os || i2c_smbus_read_word_data(new_client, 7) != os) - goto exit_free; + return -ENODEV; /* Unused bits */ if (conf & 0xe0) - goto exit_free; + return -ENODEV; /* Addresses cycling */ for (i = 8; i < 0xff; i += 8) if (i2c_smbus_read_byte_data(new_client, i + 1) != conf || i2c_smbus_read_word_data(new_client, i + 2) != hyst || i2c_smbus_read_word_data(new_client, i + 3) != os) - goto exit_free; + return -ENODEV; } - /* Determine the chip type - only one kind supported! */ - if (kind <= 0) - kind = lm75; - - if (kind == lm75) { - name = "lm75"; - } - - /* Fill in the remaining client fields and put it into the global list */ - strlcpy(new_client->name, name, I2C_NAME_SIZE); - data->valid = 0; - mutex_init(&data->update_lock); - - /* Tell the I2C layer a new client has arrived */ - if ((err = i2c_attach_client(new_client))) - goto exit_free; - - /* Initialize the LM75 chip */ - lm75_init_client(new_client); - - /* Register sysfs hooks */ - if ((err = sysfs_create_group(&new_client->dev.kobj, &lm75_group))) - goto exit_detach; - - data->hwmon_dev = hwmon_device_register(&new_client->dev); - if (IS_ERR(data->hwmon_dev)) { - err = PTR_ERR(data->hwmon_dev); - goto exit_remove; - } + /* NOTE: we treat "force=..." and "force_lm75=..." the same. + * Only new-style driver binding distinguishes chip types. + */ + strlcpy(info->type, "lm75", I2C_NAME_SIZE); return 0; - -exit_remove: - sysfs_remove_group(&new_client->dev.kobj, &lm75_group); -exit_detach: - i2c_detach_client(new_client); -exit_free: - kfree(data); -exit: - return err; } -static int lm75_detach_client(struct i2c_client *client) -{ - struct lm75_data *data = i2c_get_clientdata(client); - hwmon_device_unregister(data->hwmon_dev); - sysfs_remove_group(&client->dev.kobj, &lm75_group); - i2c_detach_client(client); - kfree(data); - return 0; -} +static struct i2c_driver lm75_driver = { + .class = I2C_CLASS_HWMON, + .driver = { + .name = "lm75", + }, + .probe = lm75_probe, + .remove = lm75_remove, + .id_table = lm75_ids, + .detect = lm75_detect, + .address_data = &addr_data, +}; + +/*-----------------------------------------------------------------------*/ + +/* register access */ /* All registers are word-sized, except for the configuration register. LM75 uses a high-byte first convention, which is exactly opposite to @@ -268,16 +328,6 @@ static int lm75_write_value(struct i2c_client *client, u8 reg, u16 value) return i2c_smbus_write_word_data(client, reg, swab16(value)); } -static void lm75_init_client(struct i2c_client *client) -{ - int reg; - - /* Enable if in shutdown mode */ - reg = lm75_read_value(client, LM75_REG_CONF); - if (reg >= 0 && (reg & 0x01)) - lm75_write_value(client, LM75_REG_CONF, reg & 0xfe); -} - static struct lm75_data *lm75_update_device(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); @@ -309,6 +359,10 @@ static struct lm75_data *lm75_update_device(struct device *dev) return data; } +/*-----------------------------------------------------------------------*/ + +/* module glue */ + static int __init sensors_lm75_init(void) { return i2c_add_driver(&lm75_driver); |